Question

我有

auto foo = [](FooPtr p) {return p->m_delete;};
std::deque<FooPtr> d = getD();
d.erase(std::remove(d.begin(), d.end(), foo), d.end());

我得到了大量的模板参数推断/替换失败的编译错误列表：

/opt/rh/devtoolset-3/root/usr/include/c++/4.9.2/bits/stl_deque.h:258:5: note:   template argument deduction/substitution failed:

/opt/rh/devtoolset-3/root/usr/include/c++/4.9.2/bits/predefined_ops.h:191:17: note:   'std::shared_ptr<Foo>' is not derived from 'const std::deque<_Tp, _Alloc>'
{ return *__it == _M_value; }

/opt/rh/devtoolset-3/root/usr/include/c++/4.9.2/bits/predefined_ops.h:191:17: note:   'std::shared_ptr<Foo>' is not derived from 'const std::normal_distribution<_RealType>'

/opt/rh/devtoolset-3/root/usr/include/c++/4.9.2/bits/predefined_ops.h:191:17: note:   'std::shared_ptr<Foo>' is not derived from 'const std::list<_Tp, _Alloc>'
{ return *__it == _M_value; }

此列表会持续很长时间。知道我擦除删除的错误吗？

Answer 1

您使用的是错误的算法。 std::remove()期望一个值 - 一个FooPtr - 您应该使用std::remove_if()来指定一个谓词。

查看http://en.cppreference.com/w/cpp/algorithm/remove

上的文档

C ++擦除 - 删除类型扣除失败

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